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Everything You Need to Know About $PATH in Bash

admin by admin
April 23, 2020
in Lập Trình Linux
42
Everything You Need to Know About $PATH in Bash



How does Linux know where to look for the commands that you type at the command-line? In this video you’ll learn how the $PATH variable works in Linux. Specifically, we’ll look at how this value is looked up in bash, and how you can modify it.

I’ll also introduce you to the `which` command, which you can use to check which filepath bash is using for a given name (executable).

To modify PATH for
-a single user (normal or root): /home/username/.bash_profile
-all users except root: /etc/profile

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Comments 42

  1. Gstech1000 says:
    3 years ago

    Very helpful!

    Reply
  2. IronPump89 says:
    3 years ago

    what would be the effect of "export PATH=………" ? Am I adding a path to the existing list of paths? Or do I override all the previous directories? And why export? Thank you

    Reply
  3. SMS says:
    3 years ago

    Thank you for the explanation on this, I failed to fully grasp $PATH until your video.

    Reply
  4. Corey Borders says:
    3 years ago

    Super useful, thank you!

    Reply
  5. l rosales says:
    3 years ago

    Finally a Linux tutorial where I can actually understand the speaker ! Thank you for this!!! 😉

    Reply
  6. H V says:
    3 years ago

    Don't see .bash_profile in Ubuntu 18.04 or /etc/profile

    Reply
  7. Tarun Solanki says:
    3 years ago

    Thanks a lot. That was really helpful.

    Reply
  8. Darrell Turner says:
    3 years ago

    Is not usr "universal system resource" and not "user"?

    Reply
  9. Using Vanced, plz don't ban says:
    3 years ago

    This was a BRILLIANT tutorial, thank you so much for doing this! 😀

    Reply
  10. Raphael Silva says:
    3 years ago

    Valeu consagrado!

    Reply
  11. valentin bichok says:
    3 years ago

    HI, in the end of your video i tried to open the .bash_profile files and they were different, and hard coding the path didn't work, maybe the structure got updated ?

    Reply
  12. Ярослав Тавченков says:
    3 years ago

    Отличное видео и хороший русский акцент!

    p.s. Из России с любовью

    Reply
  13. zaphbeeblebrox says:
    3 years ago

    Nicely done!

    Reply
  14. Jonathan Ankiewicz says:
    3 years ago

    love these videos

    Reply
  15. w[tmyps says:
    3 years ago

    5:53 pidr

    Reply
  16. Juan2003gtr says:
    3 years ago

    great dude

    Reply
  17. Xingming Pinyin says:
    3 years ago

    how to remove path

    Reply
  18. Asen Stoyanov says:
    3 years ago

    The game is Monkey Island? =]

    Reply
  19. Phuc Nguyen says:
    3 years ago

    you are sooo funny with that accent, really. I laughed

    Reply
  20. 20th Century Fox Youtube 2 weeks ago 4 weeks ago says:
    3 years ago

    4:40 the evil

    Reply
  21. Andrew Stallard says:
    3 years ago

    I tried the command subversion trick earlier in the video with both my virtual (Ubuntu) and my main (Centos 7.0) machines.

    I changed the $PATH variable on the command line by placing /root in the front. When echo-ing $PATH, the /root directory does in fact appear first. Then, I created a script called clear that just echoes a short line. It didn't work; the screen simply cleared as normal. Then I tried changing the .bash_profile in my Centos 7.0 machine and did the same thing. The clear command just cleared the screen as usual.

    What is happening?

    Reply
  22. Andrew Stallard says:
    3 years ago

    There is no .bash_profile on my Ubuntu (virtual) machine. Are there any other ways to change the $PATH variable?

    Reply
  23. Mikail Akintunde says:
    3 years ago

    i didn't get anything about this . i need help

    Reply
  24. Chris Chapman says:
    3 years ago

    Very helpful. Thanks!!!!!

    Reply
  25. Sadiq Yusuf ilu says:
    3 years ago

    Thank you very much…

    Reply
  26. Asra Mogal says:
    3 years ago

    sir!!can u make a video on how doe sthe mkdir command work??what are the inode numbers for . and .. after mkdir completes??

    Reply
  27. Piao Rou says:
    3 years ago

    There's no ~/.bash_profile in my ubuntu 18.04. But there is a ~/.profile
    here it is:
    *****@*******:~$ cat .profile
    # ~/.profile: executed by the command interpreter for login shells.
    # This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
    # exists.
    # see /usr/share/doc/bash/examples/startup-files for examples.
    # the files are located in the bash-doc package.

    # the default umask is set in /etc/profile; for setting the umask
    # for ssh logins, install and configure the libpam-umask package.
    #umask 022

    # if running bash
    if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
    . "$HOME/.bashrc"
    fi
    fi

    # set PATH so it includes user's private bin if it exists
    if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
    fi

    # set PATH so it includes user's private bin if it exists
    if [ -d "$HOME/.local/bin" ] ; then
    PATH="$HOME/.local/bin:$PATH"
    fi

    Reply
  28. Nick Apperley says:
    3 years ago

    Reference to Deus Ex quote in the script ( https://youtu.be/rJMFxIbDe-g?list=PLtK75qxsQaMIlFCcFZpTBLnaCJ0I0uiaY&t=324 )

    Reply
  29. Christopher Carr says:
    3 years ago

    I understand that "sudo" is Super User Do [du], but I just can't abide it being pronounced like "sue-doo", rather than like "pseudo." It just sounds stupid.

    But then I'm easily annoyed.

    Reply
  30. Prashant Gupta says:
    3 years ago

    Very helpful .thanks

    Reply
  31. Edu Fontes says:
    3 years ago

    Thank you!

    Reply
  32. Maceo Lewis says:
    3 years ago

    Apologies if this is a dumb question, but I'm new to learning all of this. In regards to prepending to a path, did you place sudo within the root directory prior to prepending the root directory?

    Reply
  33. Kajsa Eriksson Rosenqvist says:
    3 years ago

    I wanted to add to the PATH for all users, but when I looked in etc/profile there is no usage of PATH at all. Where could it be set instead?

    Reply
  34. Nagios Test says:
    3 years ago

    Tip: Always use "su – root", never "su root". With 'su – root' you will get the environment variables of root, with "su root" you keep the environment variables of the current user. Or even more secure use "/sbin/su – root"

    Reply
  35. Anders Eklöv says:
    3 years ago

    Thanks! Finally a video where someone speaks english, not bash!

    Reply
  36. Epowouid says:
    3 years ago

    I don't have a .bash_profile just a .profile , on Ubuntu 16.04 😀

    Reply
  37. Manu says:
    3 years ago

    been working with Linux servers for a long while now, never got to understand what PATH is for, thanks for your tutorial now i understand its importance!

    Reply
  38. Ivan Romaniv says:
    3 years ago

    Video is simply brilliant! Thanks !

    Reply
  39. lib xo says:
    3 years ago

    Who is seeing "Hi my name is josh and blah blah " udemy add. I watch this every time !!!!!!!

    Reply
  40. Félix Sanz says:
    3 years ago

    bash_profile only works on bash. You better start using .pam_environment

    Reply
  41. mistaecco says:
    3 years ago

    While messing with linux and learning stuff, I've been running a set of automatic youtube downlaod scripts to archive interesting and useful channels that I'd like to have for the future. You made the cut, but this video broke the file management, haha. "du -h" on my archive drive makes this one split into 17 different files called:
    everything you need to know about
    everything you need to know about /usr
    everything you need to know about /usr/local
    everything you need to know about /usr/local/sbin:
    everything you need to know about /usr/local/sbin:/usr
    and this keeps going until
    everything you need to know about /usr/local/sbun:/usr/local/bin:/usr/sbin:/usr/bin:sbin:/bin:/usr/local/games:/usr

    Reply
  42. Nathaniel Lough says:
    3 years ago

    At 7:41, 7:50, and 8:06 I swear I hear some sort of custom sound effects. Do you have something going on?

    Reply

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